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A hard-headed hacker is attempting to login into Larry’s Amazon account by guessing his password. The...

A hard-headed hacker is attempting to login into Larry’s Amazon account by guessing his password. The hacker does not give up until she tries 1 thousand different passwords. What is the probability that she will guess the password and break in if, by rules, the password must consist of:

a. 8 different lower-case letters

b. 8 different letters, some may be upper-case, and it is case sensitive

c. any 8 letters, upper- or lower-case, and it is case sensitive

d. any 8 characters including letters and digits

Math   Statistics-And-Probability   
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